Reply to "Carb Jetting"

I would start with 140 main 55 idle and I would check to make sure but your main venturi's should be 36's unless someone really de sized the carbs for some reason. I have no experience with the MX version of this Weber but don't know why the main Venturi would be so small. Are you sure they are not 40 IDFs instead of 44's? The 44 IDF carbs came stock with 36 venturi's, 135 main, 50 idle and I think 200 air corr. jet with the F11 emulsion and the 50 accelerator pump. The 65 idle is way too big and I bet the plugs are black and the tail pipe in black inside. People over jet the idle to cover up other issues. The plug electrodes should be chocolate brown in color if the jetting is right. Good luck and keep asking questions.

10/27/201:27 PM

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